/**
 * Created by PanJiaChen on 16/11/18.
 */

/**
 * Parse the time to string
 * @param {(Object|string|number)} time
 * @param {string} cFormat
 * @returns {string | null}
 */
export function parseTime(time, cFormat) {
  if (arguments.length === 0 || !time) {
    return null
  }
  const format = cFormat || '{y}-{m}-{d} {h}:{i}:{s}'
  let date
  if (typeof time === 'object') {
    date = time
  } else {
    if ((typeof time === 'string')) {
      if ((/^[0-9]+$/.test(time))) {
        // support "1548221490638"
        time = parseInt(time)
      } else {
        // support safari
        // https://stackoverflow.com/questions/4310953/invalid-date-in-safari
        time = time.replace(new RegExp(/-/gm), '/')
      }
    }

    if ((typeof time === 'number') && (time.toString().length === 10)) {
      time = time * 1000
    }
    date = new Date(time)
  }
  const formatObj = {
    y: date.getFullYear(),
    m: date.getMonth() + 1,
    d: date.getDate(),
    h: date.getHours(),
    i: date.getMinutes(),
    s: date.getSeconds(),
    a: date.getDay()
  }
  const time_str = format.replace(/{([ymdhisa])+}/g, (result, key) => {
    const value = formatObj[key]
    // Note: getDay() returns 0 on Sunday
    if (key === 'a') { return ['日', '一', '二', '三', '四', '五', '六'][value ] }
    return value.toString().padStart(2, '0')
  })
  return time_str
}

/**
 * @param {number} time
 * @param {string} option
 * @returns {string}
 */
export function formatTime(time, option) {
  if (('' + time).length === 10) {
    time = parseInt(time) * 1000
  } else {
    time = +time
  }
  const d = new Date(time)
  const now = Date.now()

  const diff = (now - d) / 1000

  if (diff < 30) {
    return '刚刚'
  } else if (diff < 3600) {
    // less 1 hour
    return Math.ceil(diff / 60) + '分钟前'
  } else if (diff < 3600 * 24) {
    return Math.ceil(diff / 3600) + '小时前'
  } else if (diff < 3600 * 24 * 2) {
    return '1天前'
  }
  if (option) {
    return parseTime(time, option)
  } else {
    return (
      d.getMonth() +
      1 +
      '月' +
      d.getDate() +
      '日' +
      d.getHours() +
      '时' +
      d.getMinutes() +
      '分'
    )
  }
}

/**
 * @param {string} url
 * @returns {Object}
 */
export function param2Obj(url) {
  const search = decodeURIComponent(url.split('?')[1]).replace(/\+/g, ' ')
  if (!search) {
    return {}
  }
  const obj = {}
  const searchArr = search.split('&')
  searchArr.forEach(v => {
    const index = v.indexOf('=')
    if (index !== -1) {
      const name = v.substring(0, index)
      const val = v.substring(index + 1, v.length)
      obj[name] = val
    }
  })
  return obj
}

// 函数节流-封装
export function throttle(callback, delay){	
	let pre = 0 // 默认值不要是Date.now() ==> 第1次事件立即调用
	return function(e) { // 节流函数/真正的事件回调函数   this是发生事件的标签
		const current = Date.now()
		if (current - pre > delay) { // 只有离上一次调用callback的时间差大于delay
			// 调用真正处理事件的函数, this是事件源, 参数是event
			callback.call(this, e)
			// 记录此次调用的时间
			pre = current
		}
	}
}

// 函数防抖-封装
export function debounce(callback, delay){
	return function(event) {
		// 如果上次事件还没有真正处理, 取消它
		// if (callback.timeoutId) { // 会查找原型链
		if (callback.hasOwnProperty('timeId')) { // 不会查找原型链
			// 清除
			clearTimeout(callback.timeId)
		}

		// 发事件发生指定事件后才调用处理事件的回调函数
		// 启动定时器, 只是准备真正处理
		callback.timeId = setTimeout(() => {
			// 正在处理事件
			callback.call(this, event)
			// 删除准备处理的标记
			delete callback.timeId
		}, delay)
	}
}

//通过js的内置对象JSON来进行数组对象的深拷贝
export function deepClone(obj){
    var _obj = JSON.stringify(obj),
        objClone = JSON.parse(_obj);
    return objClone;
}